Take it to a dealer or a compitant mechanic they should figure it out but by the chart in the thread it looks like camber but it could be anything really. Good luck

had this problem on my '03 Monte LS a few years ago, both tires wearing very fast on outer edges, problem turned out to be bent suspension parts, get it checked

Thanks for all the replies everyone. I plan on taking it to a mechanic tomorrow to take a peek at it. Hopefully it won't cost too much to get it fixed. Thanks again everyone!